I'm a bit confused...do you mean that LW won't install? Or has it installed ok but now won't open?
If installs the prob, this might help:
http://www.gnutellaforums.com/showth...e+wont+install
If it won't open, follow the links here:
http://www.gnutellaforums.com/showth...wire+wont+open
(some of the fixes are probably the same for both probs)